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Finding the Fourth Proportional to 68,478.35, 102,728.57 and 21,093.44

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Solution

The fourth proportional to 68,478.35, 102,728.57 and 21,093.44 is: 31,643.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,478.35 : 102,728.57 = 21,093.44 : x
  2. Step 2: Convert to fraction form
    68,478.35/102,728.57 = 21,093.44/x
  3. Step 3: Cross multiply
    68,478.35x = 102,728.57 × 21,093.44
  4. Step 4: Simplify right side
    68,478.35x = 2,166,898,308.47
  5. Step 5: Solve for x
    x = 2,166,898,308.47/68,478.35
  6. Step 6: Final answer
    x = 31,643.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.